OPB-40C04-4-5 40 mm Dia. N-BK7 Round Optical Parallel Flat Window; t=4 mm Uncoated

The OPB-40C04-4-5 is a high-quality optical window from OptoSigma, designed for a wide range of applications. This window boasts a 40 mm diameter and a thickness of 4 mm, making it suitable for use in systems where a larger aperture and robust design are required.

The window is made from N-BK7, a popular glass type in the optical industry due to its excellent optical properties and high damage threshold. This material, also known as Schott BK7, is a borosilicate crown glass with a refractive index of approximately 1.5168 at 588 nm, making it an ideal choice for visible light applications.

The window features a flat geometry, ensuring that light passing through it experiences minimal distortion. This makes it suitable for use in imaging systems, beam shaping applications, and other scenarios where maintaining the integrity of the light path is crucial.

Notably, this window is uncoated. While coatings can enhance the performance of optical elements in specific applications, an uncoated window can offer advantages such as broadband transmission, ease of cleaning, and lower cost.

According to the vendor's website, this item is currently in stock, ensuring quick delivery for your optical project needs.